Press



Aug. 18, 1931.

A. FRlz PRESS Filed Feb. `19, 1950 2 Sheets-Sheet J.

Aug. 18,1931. .FRIZ I 1,819,704l

v PRESS Filed Feb. 19, 1930 2 Smets-sheetl 2 fr *a I; S ,fz /f E ff* 3 nI Mg@ y Mm Wg.

Patented ug. 1.8, 1931 UNITED STATES A;DoLF Falz, orsrUTTGAR'r-cANNs'rAK'rT, GERMANY PRESS Application led February 19,A1930, Serial No. 429,606, and in Germany March 1, 1929.

M invention relates to presses and more partlcularlyto power presses. Itis an object of my invention to provide a press in which the advantagesofmechanical and luid operation are combined.

' 'To this end I provide mechanical means for performing. the primarystage of the pressing operation, and luid-controlled-means forperforming its final stage.

My invention will be described in connec` tion with a machine forpressing ply-wood, but it is to be understood thatl am not limited tothis particular type of machine but may adapt my invention to anytype ofpress, for instance to hailing presses.

' Hydraulic presses are comparatively high, which is inconvenient as itis often necessary to provide a deep pit for accommodating the machinein a low shop. Such presses While 2o presenting the advantage that theoperating pressure can be ascertained very exactly by pressure gaugesthroughout the operation, involve the drawback that their operation isslow, unless auxiliary cylinders are provided for performing the primarystroke at a faster rate. On the other hand mechanical presses and moreparticularly presses equipped with electric motors operate at a higherrate but involve: the drawback that the o erating pressure can beascertained only rom the power input of the motor, a

system which is rather inaccurate.

y These drawbacks are.` removed, according to my invention, by acombined operating system. The primary stage is performed by mechanicalmeans, for instance by a motor in combination with reduction gearing,racks or spindles, and the final stage is performed under the action offluid under pressure, for instance by a'hydraulic machine.

In a preferred embodiment of my invention I provide a presser plate, anut on the presser plate which is Supported on a vertical spindle, orany number of nuts and spindles as required, generally a pair ofspindles, each with a nut. The spindle, or

spindles, is .held against -rotation while a motor with a/worm gear isprovided for imparting rotation to the nut so as to raise and lower thepresser plate which is supported Fig. 1, drawn to a larger scale.

on the nut or nuts. The spindle or spindles, is adapted to be displacedaxially and provided with a hydraulic piston.

The motor is operated during the primary l stage of the pressingoperation, i. e. until the presser plate encounters a considerableresistance. The presser plate now becomes stationary and upon furtherrotation of the Worm gear the spindle is raised. When the piston of thespindle has arrived at the upper end of its stroke the current supply tothe motor is switched 0H, preferably b automatic means and a pump isstarted or supplying liquid to the hydraulic cylinder. The spindle withthe presser plate now, descends and performs the final stage underhydraulic pressure.

In the drawings aixed to this specification and forming part thereof aply-wood press embodying my invention is illustrated dia. grammaticallyby way of example.

In the drawings f Fig. 1 is an elevation,

Fig. 2 is an. end elevation of the preSS, viewed from the right in Fig.1, with the motor removed, and4 Fig. 3 is a section on the line III-IIIin Referring now to the drawings, the frame of the press is built upfrom vertical and horizontal sections. The pair of vertical sectionsconstituting the upright at the left of the press is indicated at 1 and2 in Fig. 2, 3 is one of the vertical sections constitutlng the uprightat the right, 12 and 13 are channel sections connecting the upper, and 6and 7 are channel sections connecting the lower ends of the uprights. 8,9 and 10, 11 are channel sections extending across the vertical sectionsof the uprights above the channels 12, 13, and 5 is a bolster platewhichis placed across the sections 6 and 7 4 is the presser plate whichis provided with a casing 18 for the reception of the reduction gearingas will be described. v k

14 and 15 are threaded spindles which are fitted between the sections ofthe two up'- rights. The lower end of each spindle is provided with areduced extension'23 of squaresection which is inserted in a transversebar which is arranged a 24'of eachupright, as best seen in Fig. 2. Theshoulder betweenA the spindle and the extension absorbs the downwardthrust on the s indle. The vertical extension prevents rotation of thespindle but rmits axial displacement in upward direction for a purposewhich willpresentl be described. 16 `and 17 are nuts or threade sleeveswhich are mounted on the spindles 14 and 15, respectively, 19 is a wormgear on each nut, and 20,20 are worms which cooperate with the gears 19on the respective nuts. 21 is a shaft which extends throughout the frame18 of the presser plate 4 and on which the worms 20, 2O are eyed. 22 isan electric motor which imparts rotation to the shaft 21. l

25I are pistons at the ends of the s indles 14 and 15, as shown for thespindle 14 in Fig. 1, and 26 are hydraulic cylinders supported bythetransverse sections 8, 9 andlO, 11, in which cylinders the pistons 25are litted to slide. 28 is a pum 27 is a liquid reservoir ve thecylinder 26 at the left end of the machine, 29 is the suction pipe, 30is the delivery pipe of the pum V28, the

' suction pipe beingconnected with t e resertank 2 voir, and 31 is athree-way valve at the end of the pipe 30. 34 is a pi e extending fromthe three-way valve 31 to t le reservoir 27, 35 isa pipe extendin fromthe valve to the upper end of the adgacent cylinder 26, and 36 isa ppipe extending from the valve to the upper end of the cylinder 26 at theopposite .end of the press.,

37 is a hot-water tank for supplying the heated parts (not shown) of thepress.

33 is a switch inthe circuit of the motor 22, and 38 is a dog on one ofthe spindles, for instance 15, as shown in Fig.. 2, by which the currentis switched oi when the spindle has arrived at the upper end of itsstroke.

The operation of my press is as follows When the material to be pressed,in the present instance ply-wood, has been placed on the bolster plate 5the valve 31 is set so as to connect the ipe 34 with the pipes 35 and.36, and to brea the connection with the delivery ipipe 30. Pressurelessliquid from the The pistons 25 are atjthe lower end o their stroke asshown at the left in Fig. 1.

. The motor 22 is4 now started rotating the nuts 16 and 17 and loweringthe presser plate 4 with the casing 18. The downward 'movement of thepresser plate continues unf ltil the resistance of the partly compressedmaterial between the plates`4 and 5 has become equal to the thrustexerted on the presser now penetrates into the cylinders .so ythat theyare permanently filled with liquid.

The square extensions 23 are so long that they will not move out oftheir holes in the trans# 1 verse bars 24 when the spindles are shiftedso that the spindles are held a ainst rotation the pipes and 36, and tobreak the connec-A tion of these pipes with the pipe 34, and the pump 28is started. Liquid from the reservoir 27 is drawn into the pump 28through the suction pipe 29 and delivered to the cylinders 26 throughthe delivery pipe 30 and the pipes 35, 36, forcing down the pistons inthese cylinders and app ying the presser plate 4 tothe material'. Whenthe desired pressure has been attained, the pum 28 is arrested. Thepressure is read exactl;y at` a pressure gauge (not shown) as in'anyhydraulic machine. When itis desired to return the parts to theirinitial position the connection of the pipes 35 and 36 with the lishedso that the liquid rom the cylinders can be discharged into thereservoir 27 where it is not under pressure and the motor 22 is started.

The principal advantage of. my'novel press is that its operation israpid as compared with a normal hydraulic press while at the same timethe operating pressure can be read throughout the final stage.

The overall height of the press is much reduced ascompared with thenormal hydraulic presses, and the press is a self-contained unit'suitable self-contained unit is' obtained.

Other means than spindles, 'for instance racks, may be provided forreciprocating the presser plate mechanically.

I wish it to be understood that-I do not del sire to be limited to theexact details of construction shownand described forobviousmodifications will occur to a person skilled 4 in the art.

In the claims `aiixed to this specication no selection of any particularmodification of the invention is intended to the exclusion of' othermodifications thereof and the rightto subsequently make claim toanymodification not covered by these claims is expressely reserved.

1. A press comprising a frame, a bolster nut, means on said presserplate for impart- 'h ing rotation to said nut, a piston at the end ofsaid spindle, a cylinder in which said pis ton is iitted to slide, andmeans for supplying l fluid under pressure to said cylinder.

I 2. A press comprisin a frame, a bolster plate, a threaded spind e, athrust bearing for said spindle in said frame, a reduced ex- A tensionat the lower end of said spindle forming a shoulder which is supportedon said bearing, said extension being adapted to pre- Y ventrotation ofsaid spindle in said bearing lo but to permit axial displacement, a nuton said spindle, a presser plate supported on said nut, means on saidpresser plate for mparting rotation to said nut, a piston at the end ofsaid spindle, a cylinder in which said u, piston is fitted to slide, andmeans for supplying fluid under pressure to said cylinder. 3'. A presscomprising a frame having an upright, a bolster plate, a threadedspindle itted to slide in said frame but held against rotation, a nut onsaid spindle, a presser plate supported on said nut, means on saidpresser plate for imparting rotation to saidnut, a piston at the endofsaid spindle, a cylinder in which said piston is fittedv to slide,anda pump on said upright for supplying fluid under pressure to saidcylinder. y v

4. In a press, a presser plate, a spindle for actuating said presserplate, mechanical means adapted to alternately displace said plate withrespect to said spindle, and said spindle-With respect-to'isaid plate,and: hy-

draulic means adapted to exert thrust on said spindle.

5. In a press a self-contained frame comprising a base structure,uprights secured to said base structure, a presser plate in said.

frame, spindles on said uprights for actuating said presser plate,mechanical means adapted to alternately displace said plate 40 withrespect to said spindles, and said spindles with respect to said plate,and hydraulic means adapted to exert thrust on said spindles.

6. In a press a self-contained frame comprising a base structure,uprights secured to said base structure, a presser plate in said frame,spindles on said uprights for actuating said presser plate, transversemembers on l said uprights, hydraulic cylinders in said transversemembers, pistons on said spindles mounted to slide in said cylinders,step bearings for'said spindles in said base structure,` mechanicalmeans adapted to alternately displace said plate with respect to saidspindles, and-said spindles withrespect to said plate, and hydraulicmeans adapted to 'exert thrust on said spindles.

In testimony whereof I aiix my signature.

ADOLF FRIZ.

